in gplshift.ini must edited maybe
LookAroundMode = POV
there are these info

;POV = Use Point Of View hat for LOOK LEFT/RIGHT:
; (works also together with TrackIR support)

** Notice about TrackIR: **

;GPLshift+ will enable the TrackIR support if you
;have started the TrackIR software (v4.0 or Higher)
;before running GPL - You can also use the buttons
;below for Quick 73/122degrees Left/R View together
;with TrackIR´s Look Around, but remember that
;"LookLRMaxAngle = " may not exceed 60 degrees if
;you want to use "Look_Left73d_Button =" and
;"Look_Right73d_Button" Max. "LookLRMaxAngle = 100"
;for "Look_Left122Button =" "Look_Right122Button ="
;(same limit with TIR+POV)

;MOU = Use the mouse for LOOK LEFT/RIGHT 0-122 deg.
; (up to about 141 degrees in the Replay)
; One right mouse button clik for Un/freeze
; the view - Double click for setting back to
; front of view (0 degrees) in OFF mode

;e.g: 3.BUT = Using 3rd game device buttons
; 2.POV = Using 2nd game device Point of view
; 1.MOU = Using the mouse or TrackIR in Mouse
; Mode (use only number 1 with .MOU)
; --------------------------------------------

Look_Left45d_Button = ;Select a number for LOOK LEFT in 45 degrees
45 degrees
Look_Left73d_Button = ;Select a number for LOOK LEFT in 73 degrees
73 degrees
Look_Left122d_Button = ;Select a number for LOOK LEFT in 122 in degrees
122 in degrees
Look_Right45d_Button = ;Select a number for LOOK RIGHT in 45 degrees
45 degrees
Look_Right73d_Button = ;Select a number for LOOK RIGHT in 73 degress
73 degress
Look_Right122d_Button = ;Select a number for LOOK RIGHT in 122 degrees
122 degrees
;See in GPLshift_WhatsNew###.txt how to use only 2
;buttons for Look Left/Right 45, 73 & 122 deg. via
;via Double/TripleClick, NB: Look Lft/Right 45 deg.
;support is disable when using TrackIR unit.
;--------------------------------------------------
LookLeftRightDeadZone = 1 ;OPTIONS: 0 1 2 3 4 5 6 7 8 9 ;EFFECT:
;Set the size of DeadZone for MOU/TrackIR mode, e.g

I experiment the exact problem mentioned in the thread: I get a rearview picture from my car or I experiment a strange screen with black and white point on all the screen. Very strange. And I'm searchin for a solution since a long time ago...I not despair. I have seen some vids with trackir woriking so why not for me ?

The noise screen is normally an indication that the camera is below the surface.
So it seems your camera starting point is off or already triggered by the trackir to look way down.
That's all i can say since i don't have a trackir gear.

Maybe fix the Look_Up_Down by using a "0" to check if that would give a proper view at all?